<?xml version="1.0" encoding="us-ascii"?>
<!--
Taxonomy Definition Links linkbase based on XBRL standard Version 2.1.
Created by UBmatrix Taxonomy Designer 3.0.3.2436 (2009-06-02 13:18).  
Contact www.ubmatrix.com
Copyright (c) 2002-2013 UBmatrix inc., All Rights Reserved
Produced on 2013-06-07 17:53:15
-->
<linkbase
  xmlns="http://www.xbrl.org/2003/linkbase"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xsi:schemaLocation="
    http://www.xbrl.org/2003/linkbase 
      http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd
    http://xbrl.org/2005/xbrldt  http://www.xbrl.org/2005/xbrldt-2005.xsd
    ">
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#DocumentInformationDocument"
    roleURI="http://www.abc.com/role/DocumentInformation" />
  <arcroleRef xlink:type="simple"
    xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"
    arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
  <arcroleRef xlink:type="simple"
    xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"
    arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
  <arcroleRef xlink:type="simple"
    xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"
    arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
  <arcroleRef xlink:type="simple"
    xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"
    arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
  <arcroleRef xlink:type="simple"
    xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"
    arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#EntityInformationDocument"
    roleURI="http://www.abc.com/role/EntityInformation" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#EntityListingsInformationDocument"
    roleURI="http://www.abc.com/role/EntityListingsInformation" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#BalanceSheet"
    roleURI="http://www.abc.com/role/BalanceSheet" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#BalanceSheetParentheticalGeneralParentheticals"
    roleURI="http://www.abc.com/role/BalanceSheetParentheticalGeneral" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#BalanceSheetParentheticalPreferredStock"
    roleURI="http://www.abc.com/role/BalanceSheetParentheticalPreferredStock" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#BalanceSheetParentheticalCommonStock"
    roleURI="http://www.abc.com/role/BalanceSheetParentheticalCommonStock" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#BalanceSheetParentheticalTreasuryStock"
    roleURI="http://www.abc.com/role/BalanceSheetParentheticalTreasuryStock" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#IncomeStatement"
    roleURI="http://www.abc.com/role/IncomeStatement" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#ComprehensiveIncome"
    roleURI="http://www.abc.com/role/ComprehensiveIncome" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#CashFlowStatement"
    roleURI="http://www.abc.com/role/CashFlowStatement" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#PriorPeriodAdjustment"
    roleURI="http://www.abc.com/role/PriorPeriodAdjustment" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#ChangesInTotalStockholdersEquity"
    roleURI="http://www.abc.com/role/ChangesInTotalStockholdersEquity" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#NatureOfBusinessDetails"
    roleURI="http://www.abc.com/role/NatureOfBusiness" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#SignificantAccountingPoliciesPolicies"
    roleURI="http://www.abc.com/role/SignificantAccountingPolicies" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#PropertyPlantAndEquipmentPoliciesDetails"
    roleURI="http://www.abc.com/role/PropertyPlantAndEquipmentPolicies" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#CashCashEquivalentsAndMarketableSecuritiesRollUp"
    roleURI="http://www.abc.com/role/CashCashEquivalentsAndMarketableSecurities" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#CashAndCashEquivalentsComponentsDetails"
    roleURI="http://www.abc.com/role/CashAndCashEquivalentsComponents" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#MarketableSecuritiesComponentsDetails"
    roleURI="http://www.abc.com/role/MarketableSecuritiesComponents" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#InventoryComponentsDetails"
    roleURI="http://www.abc.com/role/InventoryComponents" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#PropertyPlantAndEquipmentComponentsDetails"
    roleURI="http://www.abc.com/role/PropertyPlantAndEquipmentComponents" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#DeferredCostsDetails"
    roleURI="http://www.abc.com/role/DeferredCosts" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#ProductWarrantyAccrualDetails"
    roleURI="http://www.abc.com/role/ProductWarrantyAccrual" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#LongTermDebtInstrumentsDetails"
    roleURI="http://www.abc.com/role/LongTermDebtInstruments" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#MaturitiesOfLongTermDebtDetails"
    roleURI="http://www.abc.com/role/MaturitiesOfLongTermDebt" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#OtherNoncurrentLiabilitiesDetails"
    roleURI="http://www.abc.com/role/OtherNoncurrentLiabilities" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#BusinessSegmentsDetails"
    roleURI="http://www.abc.com/role/BusinessSegments" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#GeographicAreasDetails"
    roleURI="http://www.abc.com/role/GeographicAreas" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#NonmonetaryTransactionsDetails"
    roleURI="http://www.abc.com/role/NonmonetaryTransactions" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#OtherMattersDetails"
    roleURI="http://www.abc.com/role/SelectFinancialInformation" />
  <roleRef xlink:type="simple"
    xlink:href="abc-20121231.xsd#SubsequentEventsDetails"
    roleURI="http://www.abc.com/role/SubsequentEvents" />
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/DocumentInformation">
    <loc xlink:type="locator"
      xlink:label="dei_DocumentInformationLineItems"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentInformationLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_DocumentInformationHierarchy"
      xlink:href="abc-20121231.xsd#abc_DocumentInformationHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="dei_DocumentInformationLineItems"
      xlink:to="abc_DocumentInformationHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_DocumentType"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DocumentInformationHierarchy"
      xlink:to="dei_DocumentType"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_AmendmentFlag"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_AmendmentFlag" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DocumentInformationHierarchy"
      xlink:to="dei_AmendmentFlag"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_DocumentPeriodEndDate"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentPeriodEndDate" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DocumentInformationHierarchy"
      xlink:to="dei_DocumentPeriodEndDate"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_DocumentFiscalYearFocus"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DocumentInformationHierarchy"
      xlink:to="dei_DocumentFiscalYearFocus"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_DocumentFiscalPeriodFocus"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalPeriodFocus" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DocumentInformationHierarchy"
      xlink:to="dei_DocumentFiscalPeriodFocus"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_DocumentInformationTable"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentInformationTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="dei_DocumentInformationLineItems"
      xlink:to="dei_DocumentInformationTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="dei_DocumentInformationTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/DocumentInformation">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/EntityInformation">
    <loc xlink:type="locator"
      xlink:label="dei_EntityInformationLineItems"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityInformationLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_EntityInformationHierarchy"
      xlink:href="abc-20121231.xsd#abc_EntityInformationHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="dei_EntityInformationLineItems"
      xlink:to="abc_EntityInformationHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityRegistrantName"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityRegistrantName" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityRegistrantName"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityCentralIndexKey"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCentralIndexKey" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityCentralIndexKey"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityWellKnownSeasonedIssuer"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityWellKnownSeasonedIssuer"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_CurrentFiscalYearEndDate"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_CurrentFiscalYearEndDate" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_CurrentFiscalYearEndDate"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityCurrentReportingStatus"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCurrentReportingStatus" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityCurrentReportingStatus"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityVoluntaryFilers"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityVoluntaryFilers" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityVoluntaryFilers"
      order="6"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityFilerCategory"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityFilerCategory" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityFilerCategory"
      order="7"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityPublicFloat"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityPublicFloat" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_EntityInformationHierarchy"
      xlink:to="dei_EntityPublicFloat"
      order="8"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntitiesTable"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntitiesTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="dei_EntityInformationLineItems"
      xlink:to="dei_EntitiesTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="dei_EntitiesTable" xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/EntityInformation">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/EntityListingsInformation">
    <loc xlink:type="locator"
      xlink:label="dei_EntityListingsLineItems"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityListingsLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ListingHierarchy"
      xlink:href="abc-20121231.xsd#abc_ListingHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="dei_EntityListingsLineItems"
      xlink:to="abc_ListingHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_TradingSymbol"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_TradingSymbol" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ListingHierarchy" xlink:to="dei_TradingSymbol"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityCommonStockSharesOutstanding"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCommonStockSharesOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ListingHierarchy" xlink:to="dei_EntityCommonStockSharesOutstanding"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityListingsTable"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityListingsTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="dei_EntityListingsLineItems"
      xlink:to="dei_EntityListingsTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="dei_EntityListingsTable" xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="dei_EntityListingsTable" xlink:to="us-gaap_StatementClassOfStockAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonClassAMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonClassAMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockDomain"
      xlink:to="us-gaap_CommonClassAMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonClassBMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonClassBMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockDomain"
      xlink:to="us-gaap_CommonClassBMember"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/EntityListingsInformation">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheet">
    <loc xlink:type="locator"
      xlink:label="abc_BalanceSheetLineItems"
      xlink:href="abc-20121231.xsd#abc_BalanceSheetLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_BalanceSheetTable"
      xlink:href="abc-20121231.xsd#abc_BalanceSheetTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_BalanceSheetLineItems"
      xlink:to="abc_BalanceSheetTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_BalanceSheetTable" xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AssetsAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BalanceSheetLineItems"
      xlink:to="us-gaap_AssetsAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AssetsCurrentAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsCurrentAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashCashEquivalentsAndShortTermInvestmentsAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestmentsAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsCurrentAbstract"
      xlink:to="us-gaap_CashCashEquivalentsAndShortTermInvestmentsAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashCashEquivalentsAndShortTermInvestmentsAbstract"
      xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AvailableForSaleSecuritiesCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashCashEquivalentsAndShortTermInvestmentsAbstract"
      xlink:to="us-gaap_AvailableForSaleSecuritiesCurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashCashEquivalentsAndShortTermInvestments"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestments" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashCashEquivalentsAndShortTermInvestmentsAbstract"
      xlink:to="us-gaap_CashCashEquivalentsAndShortTermInvestments"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AccountsReceivableNetCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsCurrentAbstract"
      xlink:to="us-gaap_AccountsReceivableNetCurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryNet"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryNet" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsCurrentAbstract"
      xlink:to="us-gaap_InventoryNet"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PrepaidExpenseCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PrepaidExpenseCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsCurrentAbstract"
      xlink:to="us-gaap_PrepaidExpenseCurrent"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AssetsCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsCurrentAbstract"
      xlink:to="us-gaap_AssetsCurrent"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AssetsNoncurrentAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrentAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsNoncurrentAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentNet"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsNoncurrentAbstract"
      xlink:to="us-gaap_PropertyPlantAndEquipmentNet"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredCosts"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCosts" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsNoncurrentAbstract"
      xlink:to="us-gaap_DeferredCosts"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AssetsNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsNoncurrentAbstract"
      xlink:to="us-gaap_AssetsNoncurrent"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Assets"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_Assets"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BalanceSheetLineItems"
      xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LiabilitiesCurrentAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      xlink:to="us-gaap_LiabilitiesCurrentAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AccountsPayableCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesCurrentAbstract"
      xlink:to="us-gaap_AccountsPayableCurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AccruedLiabilitiesCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesCurrentAbstract"
      xlink:to="us-gaap_AccruedLiabilitiesCurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesCurrentAbstract"
      xlink:to="us-gaap_LongTermDebtCurrent"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualClassifiedCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesCurrentAbstract"
      xlink:to="us-gaap_ProductWarrantyAccrualClassifiedCurrent"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LiabilitiesCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesCurrentAbstract"
      xlink:to="us-gaap_LiabilitiesCurrent"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LiabilitiesNoncurrentAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      xlink:to="us-gaap_LiabilitiesNoncurrentAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_ProductWarrantyAccrualNoncurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_LongTermDebtNoncurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherLiabilitiesNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_OtherLiabilitiesNoncurrent"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LiabilitiesNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_LiabilitiesNoncurrent"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommitmentsAndContingencies"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      xlink:to="us-gaap_CommitmentsAndContingencies"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StockholdersEquityAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"
      xlink:to="us-gaap_StockholdersEquityAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredStockValueOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockValueOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_PreferredStockValueOutstanding"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonStockValueOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValueOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_CommonStockValueOutstanding"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AdditionalPaidInCapital"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapital" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_AdditionalPaidInCapital"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_TreasuryStockValue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TreasuryStockValue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_TreasuryStockValue"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit"
      order="6"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StockholdersEquity"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityAbstract"
      xlink:to="us-gaap_StockholdersEquity"
      order="7"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MinorityInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"
      xlink:to="us-gaap_MinorityInterest"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"
      xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LiabilitiesAndStockholdersEquity"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract"
      xlink:to="us-gaap_LiabilitiesAndStockholdersEquity"
      order="5"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheet">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalGeneral">
    <loc xlink:type="locator"
      xlink:label="abc_BalanceSheetParentheticalGeneralLineItems"
      xlink:href="abc-20121231.xsd#abc_BalanceSheetParentheticalGeneralLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_BalanceSheetParentheticalGeneralHierarchy"
      xlink:href="abc-20121231.xsd#abc_BalanceSheetParentheticalGeneralHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BalanceSheetParentheticalGeneralLineItems"
      xlink:to="abc_BalanceSheetParentheticalGeneralHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BalanceSheetParentheticalGeneralHierarchy"
      xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_BalanceSheetParentheticalGeneralTable"
      xlink:href="abc-20121231.xsd#abc_BalanceSheetParentheticalGeneralTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_BalanceSheetParentheticalGeneralLineItems"
      xlink:to="abc_BalanceSheetParentheticalGeneralTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_BalanceSheetParentheticalGeneralTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalGeneral">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalPreferredStock">
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ClassPreferredStockHierarchy"
      xlink:href="abc-20121231.xsd#abc_ClassPreferredStockHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockLineItems"
      xlink:to="abc_ClassPreferredStockHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassPreferredStockHierarchy"
      xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredStockSharesAuthorized"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassPreferredStockHierarchy"
      xlink:to="us-gaap_PreferredStockSharesAuthorized"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredStockSharesIssued"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesIssued" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassPreferredStockHierarchy"
      xlink:to="us-gaap_PreferredStockSharesIssued"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredStockSharesOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassPreferredStockHierarchy"
      xlink:to="us-gaap_PreferredStockSharesOutstanding"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredStockValueOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockValueOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassPreferredStockHierarchy"
      xlink:to="us-gaap_PreferredStockValueOutstanding"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfStockByClassTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_ClassOfStockLineItems"
      xlink:to="us-gaap_ScheduleOfStockByClassTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfStockByClassTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfStockByClassTable"
      xlink:to="us-gaap_StatementClassOfStockAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PreferredClassAMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredClassAMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockDomain"
      xlink:to="us-gaap_PreferredClassAMember"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalPreferredStock">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalCommonStock">
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ClassCommonStockHierarchy"
      xlink:href="abc-20121231.xsd#abc_ClassCommonStockHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockLineItems"
      xlink:to="abc_ClassCommonStockHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonStockParOrStatedValuePerShare"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassCommonStockHierarchy"
      xlink:to="us-gaap_CommonStockParOrStatedValuePerShare"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonStockSharesAuthorized"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassCommonStockHierarchy"
      xlink:to="us-gaap_CommonStockSharesAuthorized"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonStockSharesIssued"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassCommonStockHierarchy"
      xlink:to="us-gaap_CommonStockSharesIssued"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonStockSharesOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassCommonStockHierarchy"
      xlink:to="us-gaap_CommonStockSharesOutstanding"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonStockValueOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValueOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassCommonStockHierarchy"
      xlink:to="us-gaap_CommonStockValueOutstanding"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfStockByClassTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_ClassOfStockLineItems"
      xlink:to="us-gaap_ScheduleOfStockByClassTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfStockByClassTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfStockByClassTable"
      xlink:to="us-gaap_StatementClassOfStockAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonClassAMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonClassAMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockDomain"
      xlink:to="us-gaap_CommonClassAMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonClassBMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonClassBMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockDomain"
      xlink:to="us-gaap_CommonClassBMember"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalCommonStock">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalTreasuryStock">
    <loc xlink:type="locator"
      xlink:label="us-gaap_EquityClassOfTreasuryStockLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityClassOfTreasuryStockLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ClassTreasuryStockHierarchy"
      xlink:href="abc-20121231.xsd#abc_ClassTreasuryStockHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_EquityClassOfTreasuryStockLineItems"
      xlink:to="abc_ClassTreasuryStockHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_TreasuryStockShares"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TreasuryStockShares" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassTreasuryStockHierarchy"
      xlink:to="us-gaap_TreasuryStockShares"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_TreasuryStockValue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TreasuryStockValue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ClassTreasuryStockHierarchy"
      xlink:to="us-gaap_TreasuryStockValue"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfTreasuryStockTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfTreasuryStockTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_EquityClassOfTreasuryStockLineItems"
      xlink:to="us-gaap_ClassOfTreasuryStockTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ClassOfTreasuryStockTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ClassOfTreasuryStockTable"
      xlink:to="us-gaap_StatementClassOfStockAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CommonClassAMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonClassAMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ClassOfStockDomain"
      xlink:to="us-gaap_CommonClassAMember"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BalanceSheetParentheticalTreasuryStock">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementClassOfStockAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ClassOfStockDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementClassOfStockAxis"
      xlink:to="us-gaap_ClassOfStockDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/IncomeStatement">
    <loc xlink:type="locator"
      xlink:label="abc_IncomeStatementLineItems"
      xlink:href="abc-20121231.xsd#abc_IncomeStatementLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_IncomeStatementTable"
      xlink:href="abc-20121231.xsd#abc_IncomeStatementTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_IncomeStatementLineItems"
      xlink:to="abc_IncomeStatementTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_IncomeStatementTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLossAttributableToReportingEntityAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_IncomeStatementLineItems"
      xlink:to="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract"
      xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingIncomeLossAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLossAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract"
      xlink:to="us-gaap_OperatingIncomeLossAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_GrossProfitAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GrossProfitAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingIncomeLossAbstract"
      xlink:to="us-gaap_GrossProfitAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Revenues"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_GrossProfitAbstract"
      xlink:to="us-gaap_Revenues"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CostOfRevenue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfRevenue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_GrossProfitAbstract"
      xlink:to="us-gaap_CostOfRevenue"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_GrossProfit"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GrossProfit" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_GrossProfitAbstract"
      xlink:to="us-gaap_GrossProfit"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingExpensesAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpensesAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingIncomeLossAbstract"
      xlink:to="us-gaap_OperatingExpensesAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SellingGeneralAndAdministrativeExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingExpensesAbstract"
      xlink:to="us-gaap_SellingGeneralAndAdministrativeExpense"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ResearchAndDevelopmentExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingExpensesAbstract"
      xlink:to="us-gaap_ResearchAndDevelopmentExpense"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MarketingExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketingExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingExpensesAbstract"
      xlink:to="us-gaap_MarketingExpense"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherCostAndExpenseOperating"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCostAndExpenseOperating" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingExpensesAbstract"
      xlink:to="us-gaap_OtherCostAndExpenseOperating"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingExpenses"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingExpensesAbstract"
      xlink:to="us-gaap_OperatingExpenses"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingIncomeLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OperatingIncomeLossAbstract"
      xlink:to="us-gaap_OperatingIncomeLoss"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonoperatingIncomeExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonoperatingIncomeExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract"
      xlink:to="us-gaap_NonoperatingIncomeExpense"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InterestAndDebtExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestAndDebtExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract"
      xlink:to="us-gaap_InterestAndDebtExpense"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract"
      xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncomeTaxExpenseBenefit"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract"
      xlink:to="us-gaap_IncomeTaxExpenseBenefit"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProfitLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract"
      xlink:to="us-gaap_ProfitLoss"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_NetIncomeLossAttributableToRollUp"
      xlink:href="abc-20121231.xsd#abc_NetIncomeLossAttributableToRollUp" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_IncomeStatementLineItems"
      xlink:to="abc_NetIncomeLossAttributableToRollUp"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetIncomeLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NetIncomeLossAttributableToRollUp"
      xlink:to="us-gaap_NetIncomeLoss"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NetIncomeLossAttributableToRollUp"
      xlink:to="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_EarningsPerShareAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_IncomeStatementLineItems"
      xlink:to="us-gaap_EarningsPerShareAbstract"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_EarningsPerShareBasic"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasic" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_EarningsPerShareAbstract"
      xlink:to="us-gaap_EarningsPerShareBasic"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_EarningsPerShareDiluted"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareDiluted" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_EarningsPerShareAbstract"
      xlink:to="us-gaap_EarningsPerShareDiluted"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_IncomeStatementLineItems"
      xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"
      xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"
      xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/IncomeStatement">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/ComprehensiveIncome">
    <loc xlink:type="locator"
      xlink:label="abc_ComprehensiveIncomeLineItems"
      xlink:href="abc-20121231.xsd#abc_ComprehensiveIncomeLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ComprehensiveIncomeAttributableToParentRollUp"
      xlink:href="abc-20121231.xsd#abc_ComprehensiveIncomeAttributableToParentRollUp" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeLineItems"
      xlink:to="abc_ComprehensiveIncomeAttributableToParentRollUp"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_ComprehensiveIncomeRollUp"
      xlink:href="abc-20121231.xsd#abc_ComprehensiveIncomeRollUp" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeAttributableToParentRollUp"
      xlink:to="abc_ComprehensiveIncomeRollUp"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProfitLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeRollUp"
      xlink:to="us-gaap_ProfitLoss"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeRollUp"
      xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTax"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeRollUp"
      xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeAttributableToParentRollUp"
      xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ComprehensiveIncomeNetOfTax"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ComprehensiveIncomeAttributableToParentRollUp"
      xlink:to="us-gaap_ComprehensiveIncomeNetOfTax"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_ComprehensiveIncomeTable"
      xlink:href="abc-20121231.xsd#abc_ComprehensiveIncomeTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_ComprehensiveIncomeLineItems"
      xlink:to="abc_ComprehensiveIncomeTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_ComprehensiveIncomeTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/ComprehensiveIncome">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/CashFlowStatement">
    <loc xlink:type="locator"
      xlink:label="abc_CashFlowStatementLineItems"
      xlink:href="abc-20121231.xsd#abc_CashFlowStatementLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_CashCashEquivalentsRollForward"
      xlink:href="abc-20121231.xsd#abc_CashCashEquivalentsRollForward" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashFlowStatementLineItems"
      xlink:to="abc_CashCashEquivalentsRollForward"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivalentsRollForward"
      xlink:to="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProfitLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_ProfitLoss"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:to="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Depreciation"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:to="us-gaap_Depreciation"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:to="us-gaap_DeferredIncomeTaxExpenseBenefit"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherNoncashIncomeExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:to="us-gaap_OtherNoncashIncomeExpense"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInInventories"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      xlink:to="us-gaap_IncreaseDecreaseInInventories"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      xlink:to="us-gaap_IncreaseDecreaseInAccountsPayable"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      xlink:to="us-gaap_IncreaseDecreaseInAccruedLiabilities"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInOtherDeferredLiability"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherDeferredLiability" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"
      xlink:to="us-gaap_IncreaseDecreaseInOtherDeferredLiability"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"
      xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PaymentsForProceedsFromOtherInvestingActivities"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_PaymentsForProceedsFromOtherInvestingActivities"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_ProceedsFromIssuanceOfLongTermDebt"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_RepaymentsOfLongTermDebt"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_RepaymentsOfLongTermDebt"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PaymentsOfDividendsCommonStock"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_PaymentsOfDividendsCommonStock"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"
      xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract"
      xlink:to="us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivalentsRollForward"
      xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_CashFlowStatementTable"
      xlink:href="abc-20121231.xsd#abc_CashFlowStatementTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_CashFlowStatementLineItems"
      xlink:to="abc_CashFlowStatementTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_CashFlowStatementTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SupplementalCashFlowInformationAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashFlowStatementLineItems"
      xlink:to="us-gaap_SupplementalCashFlowInformationAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InterestPaid"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaid" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SupplementalCashFlowInformationAbstract"
      xlink:to="us-gaap_InterestPaid"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncomeTaxesPaid"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesPaid" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SupplementalCashFlowInformationAbstract"
      xlink:to="us-gaap_IncomeTaxesPaid"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/CashFlowStatement">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/PriorPeriodAdjustment">
    <loc xlink:type="locator"
      xlink:label="abc_ChangesInStockholdersEquityLineItems"
      xlink:href="abc-20121231.xsd#abc_ChangesInStockholdersEquityLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ChangesInStockholdersEquityTable"
      xlink:href="abc-20121231.xsd#abc_ChangesInStockholdersEquityTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_ChangesInStockholdersEquityLineItems"
      xlink:to="abc_ChangesInStockholdersEquityTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_ChangesInStockholdersEquityTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CreationDateAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreationDateAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_ChangesInStockholdersEquityTable"
      xlink:to="us-gaap_CreationDateAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_RestatedReportDateDomain"
      xlink:href="abc-20121231.xsd#abc_RestatedReportDateDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_CreationDateAxis"
      xlink:to="abc_RestatedReportDateDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_OrigionallyStatedReportDateMember"
      xlink:href="abc-20121231.xsd#abc_OrigionallyStatedReportDateMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_RestatedReportDateDomain"
      xlink:to="abc_OrigionallyStatedReportDateMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ChangesInStockholdersEquityLineItems"
      xlink:to="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_CorrectionOfPriorPeriodError"
      xlink:href="abc-20121231.xsd#abc_CorrectionOfPriorPeriodError" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="abc_CorrectionOfPriorPeriodError"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_EffectOfMandatoryChangeInAccountingPolicyForAdoptionOfFasXxx"
      xlink:href="abc-20121231.xsd#abc_EffectOfMandatoryChangeInAccountingPolicyForAdoptionOfFasXxx" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="abc_EffectOfMandatoryChangeInAccountingPolicyForAdoptionOfFasXxx"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/PriorPeriodAdjustment">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CreationDateAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreationDateAxis" />
    <loc xlink:type="locator"
      xlink:label="abc_RestatedReportDateDomain"
      xlink:href="abc-20121231.xsd#abc_RestatedReportDateDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_CreationDateAxis"
      xlink:to="abc_RestatedReportDateDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/ChangesInTotalStockholdersEquity">
    <loc xlink:type="locator"
      xlink:label="abc_ChangesInStockholdersEquityLineItems"
      xlink:href="abc-20121231.xsd#abc_ChangesInStockholdersEquityLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_ChangesInStockholdersEquityTable"
      xlink:href="abc-20121231.xsd#abc_ChangesInStockholdersEquityTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_ChangesInStockholdersEquityLineItems"
      xlink:to="abc_ChangesInStockholdersEquityTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_ChangesInStockholdersEquityTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_ChangesInStockholdersEquityLineItems"
      xlink:to="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProfitLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="us-gaap_ProfitLoss"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Dividends"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Dividends" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="us-gaap_Dividends"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"
      xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTax"
      order="4"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/ChangesInTotalStockholdersEquity">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/NatureOfBusiness">
    <loc xlink:type="locator"
      xlink:label="abc_NatureOfBusinessLineItems"
      xlink:href="abc-20121231.xsd#abc_NatureOfBusinessLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_NatureOfBusinessTable"
      xlink:href="abc-20121231.xsd#abc_NatureOfBusinessTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_NatureOfBusinessLineItems"
      xlink:to="abc_NatureOfBusinessTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_NatureOfBusinessTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NatureOfOperations"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NatureOfOperations" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NatureOfBusinessLineItems"
      xlink:to="us-gaap_NatureOfOperations"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/NatureOfBusiness">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/SignificantAccountingPolicies">
    <loc xlink:type="locator"
      xlink:label="abc_SignificantAccountingPoliciesLineItems"
      xlink:href="abc-20121231.xsd#abc_SignificantAccountingPoliciesLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_SignificantAccountingPoliciesTable"
      xlink:href="abc-20121231.xsd#abc_SignificantAccountingPoliciesTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_SignificantAccountingPoliciesLineItems"
      xlink:to="abc_SignificantAccountingPoliciesTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_SignificantAccountingPoliciesTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SignificantAccountingPoliciesLineItems"
      xlink:to="us-gaap_CashAndCashEquivalentsPolicyTextBlock"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ReceivablesPolicyTextBlock"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReceivablesPolicyTextBlock" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SignificantAccountingPoliciesLineItems"
      xlink:to="us-gaap_ReceivablesPolicyTextBlock"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryPolicyTextBlock"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryPolicyTextBlock" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SignificantAccountingPoliciesLineItems"
      xlink:to="us-gaap_InventoryPolicyTextBlock"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtPolicyTextBlock"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtPolicyTextBlock" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SignificantAccountingPoliciesLineItems"
      xlink:to="us-gaap_DebtPolicyTextBlock"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SignificantAccountingPoliciesLineItems"
      xlink:to="us-gaap_RevenueRecognitionPolicyTextBlock"
      order="5"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/SignificantAccountingPolicies">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/PropertyPlantAndEquipmentPolicies">
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_PropertyPlantEquipmentPoliciesHierarchy"
      xlink:href="abc-20121231.xsd#abc_PropertyPlantEquipmentPoliciesHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:to="abc_PropertyPlantEquipmentPoliciesHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentBasisOfValuation"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentBasisOfValuation" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_PropertyPlantEquipmentPoliciesHierarchy"
      xlink:to="us-gaap_PropertyPlantAndEquipmentBasisOfValuation"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentDepreciationMethods"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDepreciationMethods" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_PropertyPlantEquipmentPoliciesHierarchy"
      xlink:to="us-gaap_PropertyPlantAndEquipmentDepreciationMethods"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_PropertyPlantEquipmentPoliciesHierarchy"
      xlink:to="us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentDispositions"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDispositions" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_PropertyPlantEquipmentPoliciesHierarchy"
      xlink:to="us-gaap_PropertyPlantAndEquipmentDispositions"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:to="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LandMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:to="us-gaap_LandMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MachineryAndEquipmentMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MachineryAndEquipmentMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:to="us-gaap_MachineryAndEquipmentMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_FurnitureAndFixturesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:to="us-gaap_FurnitureAndFixturesMember"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/PropertyPlantAndEquipmentPolicies">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/CashCashEquivalentsAndMarketableSecurities">
    <loc xlink:type="locator"
      xlink:label="abc_CashCashEquivlentsAndMarketableSecuritiesLineItems"
      xlink:href="abc-20121231.xsd#abc_CashCashEquivlentsAndMarketableSecuritiesLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_CashCashEquivalentsAndMarketableSecuritiesTable"
      xlink:href="abc-20121231.xsd#abc_CashCashEquivalentsAndMarketableSecuritiesTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_CashCashEquivlentsAndMarketableSecuritiesLineItems"
      xlink:to="abc_CashCashEquivalentsAndMarketableSecuritiesTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_CashCashEquivalentsAndMarketableSecuritiesTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_CashCashEquivalentsMarketableSecuritiesRollUp"
      xlink:href="abc-20121231.xsd#abc_CashCashEquivalentsMarketableSecuritiesRollUp" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivlentsAndMarketableSecuritiesLineItems"
      xlink:to="abc_CashCashEquivalentsMarketableSecuritiesRollUp"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivalentsMarketableSecuritiesRollUp"
      xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AvailableForSaleSecuritiesCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivalentsMarketableSecuritiesRollUp"
      xlink:to="us-gaap_AvailableForSaleSecuritiesCurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashCashEquivalentsAndShortTermInvestments"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestments" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivalentsMarketableSecuritiesRollUp"
      xlink:to="us-gaap_CashCashEquivalentsAndShortTermInvestments"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/CashCashEquivalentsAndMarketableSecurities">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/CashAndCashEquivalentsComponents">
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_CashCashEquivalentsHierarchy"
      xlink:href="abc-20121231.xsd#abc_CashCashEquivalentsHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_CashAndCashEquivalentsLineItems"
      xlink:to="abc_CashCashEquivalentsHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_CashCashEquivalentsHierarchy"
      xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_CashAndCashEquivalentsLineItems"
      xlink:to="us-gaap_ScheduleOfCashAndCashEquivalentsTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfCashAndCashEquivalentsTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfCashAndCashEquivalentsTable"
      xlink:to="us-gaap_CashAndCashEquivalentsAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_CashAndCashEquivalentsAxis"
      xlink:to="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:to="us-gaap_CashMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_BankTimeDepositsMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BankTimeDepositsMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:to="us-gaap_BankTimeDepositsMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MoneyMarketFundsMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MoneyMarketFundsMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:to="us-gaap_MoneyMarketFundsMember"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:to="us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ForeignGovernmentDebtMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignGovernmentDebtMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:to="us-gaap_ForeignGovernmentDebtMember"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CorporateDebtSecuritiesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:to="us-gaap_CorporateDebtSecuritiesMember"
      order="6"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/CashAndCashEquivalentsComponents">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_CashAndCashEquivalentsAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_CashAndCashEquivalentsAxis"
      xlink:to="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/MarketableSecuritiesComponents">
    <loc xlink:type="locator"
      xlink:label="abc_MarketableSecuritiesLineItems"
      xlink:href="abc-20121231.xsd#abc_MarketableSecuritiesLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_MarketableSecuritiesHierarchy"
      xlink:href="abc-20121231.xsd#abc_MarketableSecuritiesHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MarketableSecuritiesLineItems"
      xlink:to="abc_MarketableSecuritiesHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AvailableForSaleSecuritiesCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MarketableSecuritiesHierarchy"
      xlink:to="us-gaap_AvailableForSaleSecuritiesCurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_MarketableSecuritiesTable"
      xlink:href="abc-20121231.xsd#abc_MarketableSecuritiesTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_MarketableSecuritiesLineItems"
      xlink:to="abc_MarketableSecuritiesTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_MarketableSecuritiesTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_MarketableSecuritiesTable"
      xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis"
      xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_BankTimeDepositsMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BankTimeDepositsMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:to="us-gaap_BankTimeDepositsMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:to="us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ForeignGovernmentDebtMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignGovernmentDebtMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:to="us-gaap_ForeignGovernmentDebtMember"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MunicipalNotesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MunicipalNotesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:to="us-gaap_MunicipalNotesMember"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_EquitySecuritiesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquitySecuritiesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:to="us-gaap_EquitySecuritiesMember"
      order="5"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/MarketableSecuritiesComponents">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis"
      xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/InventoryComponents">
    <loc xlink:type="locator"
      xlink:label="abc_InventoryComponentsLineItems"
      xlink:href="abc-20121231.xsd#abc_InventoryComponentsLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_InventoryComponentsTable"
      xlink:href="abc-20121231.xsd#abc_InventoryComponentsTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_InventoryComponentsLineItems"
      xlink:to="abc_InventoryComponentsTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_InventoryComponentsTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryNetAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryNetAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_InventoryComponentsLineItems"
      xlink:to="us-gaap_InventoryNetAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryFinishedGoods"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryFinishedGoods" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_InventoryNetAbstract"
      xlink:to="us-gaap_InventoryFinishedGoods"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryWorkInProcess"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryWorkInProcess" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_InventoryNetAbstract"
      xlink:to="us-gaap_InventoryWorkInProcess"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryRawMaterials"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryRawMaterials" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_InventoryNetAbstract"
      xlink:to="us-gaap_InventoryRawMaterials"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherInventorySupplies"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherInventorySupplies" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_InventoryNetAbstract"
      xlink:to="us-gaap_OtherInventorySupplies"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryNet"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryNet" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_InventoryNetAbstract"
      xlink:to="us-gaap_InventoryNet"
      order="5"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/InventoryComponents">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/PropertyPlantAndEquipmentComponents">
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_PropertyPlantEquipmentHierarchy"
      xlink:href="abc-20121231.xsd#abc_PropertyPlantEquipmentHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:to="abc_PropertyPlantEquipmentHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentGross"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_PropertyPlantEquipmentHierarchy"
      xlink:to="us-gaap_PropertyPlantAndEquipmentGross"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:to="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"
      xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LandMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:to="us-gaap_LandMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MachineryAndEquipmentMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MachineryAndEquipmentMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:to="us-gaap_MachineryAndEquipmentMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_FurnitureAndFixturesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:to="us-gaap_FurnitureAndFixturesMember"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems"
      xlink:to="us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract"
      xlink:to="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentNet"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract"
      xlink:to="us-gaap_PropertyPlantAndEquipmentNet"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/PropertyPlantAndEquipmentComponents">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis"
      xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/DeferredCosts">
    <loc xlink:type="locator"
      xlink:label="abc_DeferredCostsComponentsLineItems"
      xlink:href="abc-20121231.xsd#abc_DeferredCostsComponentsLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_DeferredCostsComponentsTable"
      xlink:href="abc-20121231.xsd#abc_DeferredCostsComponentsTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_DeferredCostsComponentsLineItems"
      xlink:to="abc_DeferredCostsComponentsTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_DeferredCostsComponentsTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredCostsNoncurrentAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCostsNoncurrentAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DeferredCostsComponentsLineItems"
      xlink:to="us-gaap_DeferredCostsNoncurrentAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredAdvertisingCosts"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredAdvertisingCosts" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DeferredCostsNoncurrentAbstract"
      xlink:to="us-gaap_DeferredAdvertisingCosts"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredSetUpCostsNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredSetUpCostsNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DeferredCostsNoncurrentAbstract"
      xlink:to="us-gaap_DeferredSetUpCostsNoncurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredSalesCommission"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredSalesCommission" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DeferredCostsNoncurrentAbstract"
      xlink:to="us-gaap_DeferredSalesCommission"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredCosts"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCosts" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DeferredCostsNoncurrentAbstract"
      xlink:to="us-gaap_DeferredCosts"
      order="4"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/DeferredCosts">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/ProductWarrantyAccrual">
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductLiabilityContingencyLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductLiabilityContingencyLineItems" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ProductLiabilityContingencyLineItems"
      xlink:to="us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrual"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrual" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward"
      xlink:to="us-gaap_ProductWarrantyAccrual"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualWarrantiesIssued"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualWarrantiesIssued" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward"
      xlink:to="us-gaap_ProductWarrantyAccrualWarrantiesIssued"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualPayments"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualPayments" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward"
      xlink:to="us-gaap_ProductWarrantyAccrualPayments"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_MovementInStandardAndExtendedProductWarrantyIncreaseDecreaseRollForward"
      xlink:to="us-gaap_ProductWarrantyAccrualCurrencyTranslationIncreaseDecrease"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductLiabilityContingencyTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductLiabilityContingencyTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_ProductLiabilityContingencyLineItems"
      xlink:to="us-gaap_ProductLiabilityContingencyTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ProductLiabilityContingencyTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualBalanceSheetClassificationAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualBalanceSheetClassificationAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ProductLiabilityContingencyLineItems"
      xlink:to="us-gaap_ProductWarrantyAccrualBalanceSheetClassificationAbstract"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualClassifiedCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ProductWarrantyAccrualBalanceSheetClassificationAbstract"
      xlink:to="us-gaap_ProductWarrantyAccrualClassifiedCurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProductWarrantyAccrualNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductWarrantyAccrualNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ProductWarrantyAccrualBalanceSheetClassificationAbstract"
      xlink:to="us-gaap_ProductWarrantyAccrualNoncurrent"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/ProductWarrantyAccrual">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/LongTermDebtInstruments">
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_DebtInstrumentHierarchyHierarchy"
      xlink:href="abc-20121231.xsd#abc_DebtInstrumentHierarchyHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DebtInstrumentLineItems"
      xlink:to="abc_DebtInstrumentHierarchyHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentDescription"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentDescription" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DebtInstrumentHierarchyHierarchy"
      xlink:to="us-gaap_DebtInstrumentDescription"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentCollateral"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentCollateral" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DebtInstrumentHierarchyHierarchy"
      xlink:to="us-gaap_DebtInstrumentCollateral"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentInterestRateTerms"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateTerms" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DebtInstrumentHierarchyHierarchy"
      xlink:to="us-gaap_DebtInstrumentInterestRateTerms"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentMaturityDateDescription"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DebtInstrumentHierarchyHierarchy"
      xlink:to="us-gaap_DebtInstrumentMaturityDateDescription"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebt"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_DebtInstrumentHierarchyHierarchy"
      xlink:to="us-gaap_LongTermDebt"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_DebtInstrumentLineItems"
      xlink:to="us-gaap_DebtInstrumentTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_DebtInstrumentTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongtermDebtTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_DebtInstrumentTable"
      xlink:to="us-gaap_LongtermDebtTypeAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongtermDebtTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_LongtermDebtTypeAxis"
      xlink:to="us-gaap_LongtermDebtTypeDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LoansPayableMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LoansPayableMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_LongtermDebtTypeDomain"
      xlink:to="us-gaap_LoansPayableMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_DebtInstrumentTable"
      xlink:to="us-gaap_DebtInstrumentAxis"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentNameDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_DebtInstrumentAxis"
      xlink:to="us-gaap_DebtInstrumentNameDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_DebtInstrumentAaMember"
      xlink:href="abc-20121231.xsd#abc_DebtInstrumentAaMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DebtInstrumentNameDomain"
      xlink:to="abc_DebtInstrumentAaMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_DebtInstrumentBbMember"
      xlink:href="abc-20121231.xsd#abc_DebtInstrumentBbMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DebtInstrumentNameDomain"
      xlink:to="abc_DebtInstrumentBbMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_Long-termDebtRollUp"
      xlink:href="abc-20121231.xsd#abc_Long-termDebtRollUp" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_DebtInstrumentLineItems"
      xlink:to="abc_Long-termDebtRollUp"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtCurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtCurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_Long-termDebtRollUp" xlink:to="us-gaap_LongTermDebtCurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_Long-termDebtRollUp" xlink:to="us-gaap_LongTermDebtNoncurrent"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/LongTermDebtInstruments">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongtermDebtTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongtermDebtTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_LongtermDebtTypeAxis"
      xlink:to="us-gaap_LongtermDebtTypeDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DebtInstrumentNameDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_DebtInstrumentAxis"
      xlink:to="us-gaap_DebtInstrumentNameDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/MaturitiesOfLongTermDebt">
    <loc xlink:type="locator"
      xlink:label="abc_MaturitiesOfLongTermDebtLineItems"
      xlink:href="abc-20121231.xsd#abc_MaturitiesOfLongTermDebtLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:href="abc-20121231.xsd#abc_MaturitiesLong-TermDebtRollUpRollUp" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesOfLongTermDebtLineItems"
      xlink:to="abc_MaturitiesLong-TermDebtRollUpRollUp"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"
      order="6"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_LongTermDebt"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_MaturitiesLong-TermDebtRollUpRollUp"
      xlink:to="us-gaap_LongTermDebt"
      order="7"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_MaturitiesOfLongTermDebtTable"
      xlink:href="abc-20121231.xsd#abc_MaturitiesOfLongTermDebtTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_MaturitiesOfLongTermDebtLineItems"
      xlink:to="abc_MaturitiesOfLongTermDebtTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_MaturitiesOfLongTermDebtTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/MaturitiesOfLongTermDebt">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/OtherNoncurrentLiabilities">
    <loc xlink:type="locator"
      xlink:label="abc_OtherNoncurrentLiabilitiesLineItems"
      xlink:href="abc-20121231.xsd#abc_OtherNoncurrentLiabilitiesLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_OtherNoncurrentLiabilitiesTable"
      xlink:href="abc-20121231.xsd#abc_OtherNoncurrentLiabilitiesTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_OtherNoncurrentLiabilitiesLineItems"
      xlink:to="abc_OtherNoncurrentLiabilitiesTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_OtherNoncurrentLiabilitiesTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherLiabilitiesNoncurrentAbstract"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrentAbstract" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_OtherNoncurrentLiabilitiesLineItems"
      xlink:to="us-gaap_OtherLiabilitiesNoncurrentAbstract"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherSundryLiabilitiesNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherSundryLiabilitiesNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OtherLiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_OtherSundryLiabilitiesNoncurrent"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OtherLiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OtherLiabilitiesNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_OtherLiabilitiesNoncurrentAbstract"
      xlink:to="us-gaap_OtherLiabilitiesNoncurrent"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/OtherNoncurrentLiabilities">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BusinessSegments">
    <loc xlink:type="locator"
      xlink:label="us-gaap_SegmentReportingInformationLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_BusinessSegmentInformationHierarchy"
      xlink:href="abc-20121231.xsd#abc_BusinessSegmentInformationHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentReportingInformationLineItems"
      xlink:to="abc_BusinessSegmentInformationHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Revenues"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_Revenues"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingExpenses"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_OperatingExpenses"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SellingGeneralAndAdministrativeExpense"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_SellingGeneralAndAdministrativeExpense"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Depreciation"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_Depreciation"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingIncomeLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_OperatingIncomeLoss"
      order="5"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"
      order="6"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Assets"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_BusinessSegmentInformationHierarchy"
      xlink:to="us-gaap_Assets"
      order="7"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_SegmentReportingInformationLineItems"
      xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementBusinessSegmentsAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"
      xlink:to="us-gaap_StatementBusinessSegmentsAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SegmentDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementBusinessSegmentsAxis"
      xlink:to="us-gaap_SegmentDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_BusinessSegmentAlphaMember"
      xlink:href="abc-20121231.xsd#abc_BusinessSegmentAlphaMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentDomain" xlink:to="abc_BusinessSegmentAlphaMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_BusinessSegmentBravoMember"
      xlink:href="abc-20121231.xsd#abc_BusinessSegmentBravoMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentDomain" xlink:to="abc_BusinessSegmentBravoMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_BusinessSegmentCharlieMember"
      xlink:href="abc-20121231.xsd#abc_BusinessSegmentCharlieMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentDomain" xlink:to="abc_BusinessSegmentCharlieMember"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_BusinessSegmentDeltaMember"
      xlink:href="abc-20121231.xsd#abc_BusinessSegmentDeltaMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentDomain" xlink:to="abc_BusinessSegmentDeltaMember"
      order="4"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/BusinessSegments">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementBusinessSegmentsAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SegmentDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementBusinessSegmentsAxis"
      xlink:to="us-gaap_SegmentDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/GeographicAreas">
    <loc xlink:type="locator"
      xlink:label="us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_RevenuesFromExternalCustomersHierarchy"
      xlink:href="abc-20121231.xsd#abc_RevenuesFromExternalCustomersHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"
      xlink:to="abc_RevenuesFromExternalCustomersHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Revenues"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_RevenuesFromExternalCustomersHierarchy"
      xlink:to="us-gaap_Revenues"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"
      xlink:to="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementGeographicalAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementGeographicalAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"
      xlink:to="us-gaap_StatementGeographicalAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SegmentGeographicalDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementGeographicalAxis"
      xlink:to="us-gaap_SegmentGeographicalDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NorthAmericaMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NorthAmericaMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentGeographicalDomain"
      xlink:to="us-gaap_NorthAmericaMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="country_US"
      xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_US" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NorthAmericaMember"
      xlink:to="country_US"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="country_CA"
      xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_CA" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NorthAmericaMember"
      xlink:to="country_CA"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_EuropeMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EuropeMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SegmentGeographicalDomain"
      xlink:to="us-gaap_EuropeMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="country_GB"
      xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_GB" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_EuropeMember" xlink:to="country_GB"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="country_DE"
      xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_DE" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_EuropeMember" xlink:to="country_DE"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_LongLivedAssetsHierarchy"
      xlink:href="abc-20121231.xsd#abc_LongLivedAssetsHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"
      xlink:to="abc_LongLivedAssetsHierarchy"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AssetsNoncurrent"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrent" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_LongLivedAssetsHierarchy"
      xlink:to="us-gaap_AssetsNoncurrent"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/GeographicAreas">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementGeographicalAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementGeographicalAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SegmentGeographicalDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementGeographicalAxis"
      xlink:to="us-gaap_SegmentGeographicalDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/NonmonetaryTransactions">
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_NonmonetaryTransactionHierarchy"
      xlink:href="abc-20121231.xsd#abc_NonmonetaryTransactionHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NonmonetaryTransactionLineItems"
      xlink:to="abc_NonmonetaryTransactionHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionBasisOfAccountingForAssetsTransferred"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionBasisOfAccountingForAssetsTransferred" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NonmonetaryTransactionHierarchy"
      xlink:to="us-gaap_NonmonetaryTransactionBasisOfAccountingForAssetsTransferred"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionNameOfCounterparty"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionNameOfCounterparty" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NonmonetaryTransactionHierarchy"
      xlink:to="us-gaap_NonmonetaryTransactionNameOfCounterparty"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NonmonetaryTransactionHierarchy"
      xlink:to="us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionAmountOfBarterTransaction"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionAmountOfBarterTransaction" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_NonmonetaryTransactionHierarchy"
      xlink:to="us-gaap_NonmonetaryTransactionAmountOfBarterTransaction"
      order="4"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionByTypeTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionByTypeTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_NonmonetaryTransactionLineItems"
      xlink:to="us-gaap_NonmonetaryTransactionByTypeTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_NonmonetaryTransactionByTypeTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionTypeAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_NonmonetaryTransactionByTypeTable"
      xlink:to="us-gaap_NonmonetaryTransactionTypeAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_NonmonetaryTransactionTypeAxis"
      xlink:to="us-gaap_NonmonetaryTransactionTypeDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ReceiptOfAssetsInSatisfactionOfDebtMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ReceiptOfAssetsInSatisfactionOfDebtMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NonmonetaryTransactionTypeDomain"
      xlink:to="us-gaap_ReceiptOfAssetsInSatisfactionOfDebtMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_AdvertisingBarterTransactionsMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdvertisingBarterTransactionsMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NonmonetaryTransactionTypeDomain"
      xlink:to="us-gaap_AdvertisingBarterTransactionsMember"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_InventoryExchangesMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryExchangesMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_NonmonetaryTransactionTypeDomain"
      xlink:to="us-gaap_InventoryExchangesMember"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/NonmonetaryTransactions">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionTypeAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_NonmonetaryTransactionTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonmonetaryTransactionTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_NonmonetaryTransactionTypeAxis"
      xlink:to="us-gaap_NonmonetaryTransactionTypeDomain"
      order="1"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/SelectFinancialInformation">
    <loc xlink:type="locator"
      xlink:label="abc_SelectFinancialInformationLineItems"
      xlink:href="abc-20121231.xsd#abc_SelectFinancialInformationLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_SelectFinancialInformationHierarchy"
      xlink:href="abc-20121231.xsd#abc_SelectFinancialInformationHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SelectFinancialInformationLineItems"
      xlink:to="abc_SelectFinancialInformationHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_Revenues"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SelectFinancialInformationHierarchy"
      xlink:to="us-gaap_Revenues"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_OperatingIncomeLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SelectFinancialInformationHierarchy"
      xlink:to="us-gaap_OperatingIncomeLoss"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ProfitLoss"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SelectFinancialInformationHierarchy"
      xlink:to="us-gaap_ProfitLoss"
      order="3"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="abc_SelectFinancialInformationTable"
      xlink:href="abc-20121231.xsd#abc_SelectFinancialInformationTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="abc_SelectFinancialInformationLineItems"
      xlink:to="abc_SelectFinancialInformationTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_SelectFinancialInformationTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementScenarioAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="abc_SelectFinancialInformationTable"
      xlink:to="us-gaap_StatementScenarioAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScenarioActualMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioActualMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_StatementScenarioAxis"
      xlink:to="us-gaap_ScenarioActualMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScenarioUnspecifiedDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ScenarioActualMember"
      xlink:to="us-gaap_ScenarioUnspecifiedDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScenarioForecastMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioForecastMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_ScenarioActualMember"
      xlink:to="us-gaap_ScenarioForecastMember"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/SelectFinancialInformation">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_StatementScenarioAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ScenarioActualMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioActualMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_StatementScenarioAxis"
      xlink:to="us-gaap_ScenarioActualMember"
      order="2"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/SubsequentEvents">
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventLineItems"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventLineItems" />
    <loc xlink:type="locator"
      xlink:label="abc_SubsequentEventHierarchy"
      xlink:href="abc-20121231.xsd#abc_SubsequentEventHierarchy" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SubsequentEventLineItems"
      xlink:to="abc_SubsequentEventHierarchy"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventDescription"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventDescription" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SubsequentEventHierarchy"
      xlink:to="us-gaap_SubsequentEventDescription"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventsDate"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventsDate" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="abc_SubsequentEventHierarchy"
      xlink:to="us-gaap_SubsequentEventsDate"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventTable"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTable" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
      xlink:from="us-gaap_SubsequentEventLineItems"
      xlink:to="us-gaap_SubsequentEventTable"
      order="1"
      use="optional"
      xbrldt:contextElement="segment"
      xbrldt:closed="true" />
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_SubsequentEventTable"
      xlink:to="dei_LegalEntityAxis"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeAxis" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:from="us-gaap_SubsequentEventTable"
      xlink:to="us-gaap_SubsequentEventTypeAxis"
      order="2"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:from="us-gaap_SubsequentEventTypeAxis"
      xlink:to="us-gaap_SubsequentEventTypeDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_DividendDeclaredMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendDeclaredMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SubsequentEventTypeDomain"
      xlink:to="us-gaap_DividendDeclaredMember"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_ThreatenedLitigationMember"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ThreatenedLitigationMember" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:from="us-gaap_SubsequentEventTypeDomain"
      xlink:to="us-gaap_ThreatenedLitigationMember"
      order="3"
      use="optional" />
  </definitionLink>
  <definitionLink xlink:type="extended"
    xlink:role="http://www.abc.com/role/SubsequentEvents">
    <loc xlink:type="locator"
      xlink:label="dei_LegalEntityAxis"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" />
    <loc xlink:type="locator"
      xlink:label="dei_EntityDomain"
      xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain"
      order="1"
      use="optional" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventTypeAxis"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeAxis" />
    <loc xlink:type="locator"
      xlink:label="us-gaap_SubsequentEventTypeDomain"
      xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeDomain" />
    <definitionArc xlink:type="arc"
      xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:from="us-gaap_SubsequentEventTypeAxis"
      xlink:to="us-gaap_SubsequentEventTypeDomain"
      order="1"
      use="optional" />
  </definitionLink>
</linkbase>